fxps7550_analog.c

/**
  ******************************************************************************
  * @file    fxps7550_analog.c
  * @author  Sensors Software Solution Team
  * @brief   FXPS7550 driver file
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2026 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */

//-----------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------
#include <fxps7550_analog.h>
#include "string.h"


//-----------------------------------------------------------------------
// Global Variables
//-----------------------------------------------------------------------
const char sensor_pn[] = "FXPS7550A4S";

//-----------------------------------------------------------------------
// Functions
//-----------------------------------------------------------------------

int32_t fxps7550_read_reg(stmdev_ctx_t *ctx, uint8_t reg,
                            uint8_t *data, uint16_t len)
{
  int32_t ret = FXPS7550_SUCCESS;

  if (ctx == NULL || ctx->read_reg == NULL)
  {
    return FXPS7550_INVALIDPARAM_ERR;
  }

  ret = ctx->read_reg(ctx->handle, reg, data, len);

  return ret;
}


int32_t fxps7550_write_reg(stmdev_ctx_t *ctx, uint8_t reg,
                             const uint8_t *data, uint16_t len)
{
  int32_t ret = FXPS7550_ERROR_READ_ONLY;
  return ret;
}


void fxps7550_device_id_get(stmdev_ctx_t *ctx, char *str)
{
  strcpy(str, sensor_pn);
}


int32_t fxps7550_pressure_raw_get(stmdev_ctx_t *ctx, uint16_t *pPressure)
{
  int32_t ret = FXPS7550_SUCCESS;
  int16_t raw_pressure = 0;
  uint8_t buff[2] = {0};  //FXPS7550_DATA_SIZE
  
  if (pPressure == NULL)
  {
    return FXPS7550_INVALIDPARAM_ERR;
  }

  ret = fxps7550_read_reg(ctx, 0, buff, 2);
  raw_pressure = ((int16_t)((buff[1]<< 8) & 0xFF00) | buff[0]);

  *pPressure = raw_pressure;

  return ret;
}


float fxps7550_pressure_raw_to_kpa(uint32_t pressure_raw)
{
  float pressure;
  
  /* The transfer function of the analog pressure sensor does not require
   * compensation.
   *
   * Refer to DataSheet for transfer function
   */
  pressure = FXPS7550_OFFSET + FXPS7550_SENS * ((float)pressure_raw / ADC_MAX_12BIT);
  
   
  return pressure;
}